[Electric engineering.] . onseveral doors or windows are connected in parallel andattached to one drop. To provide a drop for each door andwindow would require too large an annunciator and wouldcost too much for the ordinary run of work. ELECTRIC GAS LIGHTING. BURNERS FOR PARALLEL SYSTEM. 60. In the application of electricity to gas lighting, aspark is caused to pass between two conductors, placed nearthe burner, at the same time that the gas is turned on. Inthe parallel system of lighting,each burner is independent of allthe others, having direct con-nection between the battery wireand ground
[Electric engineering.] . onseveral doors or windows are connected in parallel andattached to one drop. To provide a drop for each door andwindow would require too large an annunciator and wouldcost too much for the ordinary run of work. ELECTRIC GAS LIGHTING. BURNERS FOR PARALLEL SYSTEM. 60. In the application of electricity to gas lighting, aspark is caused to pass between two conductors, placed nearthe burner, at the same time that the gas is turned on. Inthe parallel system of lighting,each burner is independent of allthe others, having direct con-nection between the battery wireand ground. Three differentstyles of burner are used: thependant, the ratc/iet, and theautomatic burner. 61. The pendant burner is shown in Fig. 30. A well-insulated wire is brought to theburner and secured under thehead of the screw s, therebymaking connection to the sta-tionary contact piece c, which isfastened by a screw / to theframe/ and insulated from it bywashers w. On pulling the pend-ant r downwards, the spring a fig. 44 INTERIOR WIRING. 28 is drawn across c, and, on passing off at the upper side, thebreak causes a spark which, when the gas has been turnedon, will ignite it. 62. The ratchet burner is very similar to the plainpendant, but is provided with a ratchet and pawl operatedby a pendant, a downward pull turning on the gas at thesame time that the spark is produced. A second pull extin-guishes the gas. 63. The automatic burner is shown in Fig. 31 withthe cover removed. Two wires must be provided, runningfrom a double push button, one of them leading to the wire aand the other to b. The circuit from a is through the left-hand magnet coil c to theinsulated band d, whichhas a projection e at oneside. Upon this rests ametal rod r, bent at theupper end and termina-ting in a contact piece; atthe lower end the rod isgrounded by connectionwith the frame f. Eachmagnet coil has an arma-ture g or g Avith a pro-jecting finger on the innerside. When current is sentthrough the magn
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